Previously, the PMDG Airac files from Navigraph were PMDG/PIC767 compatible. The 0713 Airac doesn't mention PIC767, while there is a separate LD767 Airac file.Which one should I use for the older PIC767?

Hi, just jumping in on the tail-end of your question. Is there a location, other than LD767's website, where you can validate your purchase and download updated cycles?

The PMDG Airac should still work with 767PIC, since PMDG used the same format. Level D uses a different format.

Thanks!

Not sure what you mean by "validate your purchase and download updated cycles," but the Navigraph website has updated Airac cycles. Unfortunately, it seems that they currently do not include updated TPs.